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Interactions Between Synthetic Vanilloids and the Endogenous Cannabinoid System

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Interactions Between Synthetic Vanilloids and the Endogenous Cannabinoid System View metadata,FEBS 20935 citation and similar papers at core.ac.uk FEBS Letters 436 (1998)brought to449^454 you by CORE provided by Elsevier - Publisher Connector Interactions between synthetic vanilloids and the endogenous cannabinoid system Vincenzo Di Marzo1;a;*, Tiziana Bisognoa, Dominique Melcka, Ruth Rossb, Heather Brockieb, Lesley Stevensonb, Roger Pertweeb, Luciano De Petrocellisc aIstituto per la Chimica di Molecole di Interesse Biologico, CNR, Via Toiano 6, 80072, Arco Felice, Napoli, Italy bDepartment of Biomedical Sciences, University of Aberdeen, Aberdeen, UK cIstituto di Cibernetica, CNR, Via Toiano 6, 80072, Arco Felice, Napoli, Italy Received 14 July 1998; received in revised form 7 September 1998 of these receptors was recently cloned and shown to mediate Abstract The chemical similarity between some synthetic agonists of vanilloid receptors, such as olvanil (N-vanillyl-cis-9- capsaicin e¡ects in dorsal root ganglia [2]. The presence of at octadecenoamide), and the `endocannabinoid' anandamide (ara- least one additional vanilloid receptor is suggested by studies chidonoyl-ethanolamide, AEA), suggests possible interactions carried out with resiniferatoxin, a phorbol derivative, the pat- between the cannabinoid and vanilloid signalling systems. Here tern of whose pharmacological actions di¡ers from that of we report that olvanil is a stable and potent inhibitor of AEA capsaicin [3]. A synthetic vanilloid derivative and anti-in£am- facilitated transport into rat basophilic leukemia (RBL-2H3) matory/analgesic compound, N-(3-methoxy-4-hydroxy-ben- cells. Olvanil blocked both the uptake and the hydrolysis of zyl)-cis-9-octadecenoamide (olvanil, [4,5], Fig. 1), was also 14 [ C]AEA by intact RBL-2H3 cells (IC50 =9 WM), while suggested to bind to a special subtype of vanilloid receptors capsaicin and pseudocapsaicin (N-vanillyl-nonanamide) were based on its non-pungency, lower toxicity and slower activa- much less active. Olvanil was more potent than previously tion kinetics of Ca2 inward currents as compared to capsai- reported inhibitors of AEA facilitated transport, i.e. phloretin cin [5,6]. It is not known whether olvanil binds to the recently (IC50 =80 WM), AM404 (12.9% inhibition at 10 WM) or oleoylethanolamide (27.5% inhibition at 10 WM). Olvanil was a cloned VR1 vanilloid receptor [2]. poor inhibitor of [14C]AEA hydrolysis by RBL-2H3 and The pharmacology and biochemistry of cannabinoid recep- N18TG2 cell membranes, suggesting that the inhibitory effect tors are better known than those of vanilloid receptors (for a on [14C]AEA breakdown observed in intact cells was due to recent review see [7]). Two di¡erent receptor subtypes, named inhibition of [14C]AEA uptake. Olvanil was stable to enzymatic CB1 and CB2, have been identi¢ed and cloned from mamma- hydrolysis, and (i) displaced the binding of high affinity lian tissues [7], and endogenous ligands for these proteins have cannabinoid receptor ligands to membrane preparations from been found. The best known `endocannabinoid' is anand- N18TG2 cells and guinea pig forebrain (Ki = 1.64^7.08 WM), but amide (arachidonoylethanolamide, AEA, [8]), whose human not from cells expressing the CB2 cannabinoid receptor subtype; and rat tissue distribution, biosynthetic and catabolic path- (ii) inhibited forskolin-induced cAMP formation in intact ways, and pharmacological actions have been thoroughly N18TG2 cells (IC50 = 1.60 WM), this effect being reversed by the selective CB1 antagonist SR141716A. Pseudocapsaicin, but studied (recently reviewed in [9]). It has been proposed that not capsaicin, also selectively bound to CB1 receptor-containing the action of AEA is terminated by facilitated transport into membranes. These data suggest that some of the analgesic cells followed by enzymatic hydrolysis of the amide bond. actions of olvanil may be due to its interactions with the Evidence for a membrane `carrier' protein selective for AEA endogenous cannabinoid system, and may lead to the design of a has been provided for rat central neurons [10,11] and rat novel class of cannabimimetics with potential therapeutic cerebellar granule cells [12] ^ which selectively express CB1 applications as analgesics. receptors [7] ^ and rat basophilic leukemia (RBL-2H3) cells z 1998 Federation of European Biochemical Societies. [13] ^ which contain CB2 receptors [7,16]. AEA facilitated transport is inhibited by alkylating agents [13], phloretin Key words: Vanilloid receptor; Cannabinoid receptor; Endocannabinoid; Anandamide; Capsaicin; In£ammation; and oleoylethanolamide [12], and some aromatic derivatives Antinociception; Mast cell of AEA such as N-benzyl-arachidonamide [12] and N-(4-hy- droxyphenyl)-arachidonamide (AM404) [11]. Once inside cells, AEA is hydrolyzed to arachidonate and ethanolamine via the action of `fatty acid amide hydrolase' (FAAH), an 1. Introduction enzyme which recognizes as substrates several long chain fatty acid amides and esters [14,15], including a potent anti-in£am- Evidence exists for the presence, in sensory neurons and matory congener of AEA, palmitoylethanolamide (PEA, some peripheral tissues, of distinct types of vanilloid receptors [13,16]). that are activated by the natural component of chili peppers, Starting from the chemical similarity between long chain capsaicin (N-(3-methoxy-4-hydroxy-benzyl)-8-methyl-6-trans- capsaicin analogues and AEA or, particularly, aromatic inhib- nonenamide or N-vanillyl-8-methyl-6-trans-nonenamide, Fig. itors of AEA facilitated transport [11,12], we have examined 1), and antagonized by capsazepine (for a review [1]). One whether capsaicin-like compounds could interact with the best characterized proteins of the `endogenous cannabinoid sys- *Corresponding author. Fax: (39) (81) 8041770. tem', i.e. the AEA `carrier', FAAH and the two cannabinoid E-mail: [email protected] receptor subtypes. We report that olvanil is a potent inhibitor 1Affiliated with the National Institute for the Chemistry of Biological of AEA facilitated transport into RBL-2H3 cells, and both Systems, CNR. olvanil and another capsaicin congener, N-vanillyl-nonan- 0014-5793/98/$19.00 ß 1998 Federation of European Biochemical Societies. All rights reserved. PII: S0014-5793(98)01175-2 FEBS 20935 8-10-98 450 V. Di Marzo et al./FEBS Letters 436 (1998) 449^454 amide (pseudocapsaicin), but not capsaicin, weakly bind to binding was calculated by using either 1 WM unlabelled CP 55 940, CB1, but not CB2, cannabinoid receptors. or 10 WM unlabelled SR 141716A (kindly donated by Sano¢ Re- cherche, Montpellier) or HU-210 (kindly donated by Prof. R. Me- choulam, The Hebrew University of Jerusalem). The concentration 2. Materials and methods of unlabelled ligand that produced a 50% displacement of the labelled ligands from speci¢c binding sites was calculated using GraphPad Prism (GraphPad Software, San Diego, CA, USA). Ki values were Mouse neuroblastoma N18TG2, mouse J774 macrophages and calculated by means of the Cheng-Pruso¡ equation from the K val- 14 d RBL-2H3 cells were cultured as described previously [9,13]. [ C]AEA ues for each radiolabelled ligand in each of the membrane systems 14 and [ C]PEA (5 mCi/mmol) were synthesized as described previously used. Cyclic AMP (cAMP) assays were performed in the Naples lab- 14 [8] starting from [ C]ethanolamine and the corresponding fatty acyl oratory on intact con£uent N18TG2 cells plated in six-well dishes and chlorides. Anandamide and oleoylethanolamide were synthesized like- stimulated for 10 min at 37³C with 1 WM forskolin in 400 Wl of serum- wise from ethanolamine and arachidonoyl- or oleoyl-chlorides. free Dulbecco's modi¢ed Eagle's Medium containing 20 mM HEPES, 3 [ H]SR 141716A (55 Ci/mmol) was purchased from Amersham, 0.1 mg/ml BSA, 0.1 mM 1-methyl-3-isobutylxanthine (Sigma) and 3 3 whereas [ H]CP 55 940 (164 Ci/mmol) and [ H]WIN 55 212-2 (43 Ci/m- either vehicle (ethanol) or anandamide, olvanil and olvanil plus SR mol) were purchased from NEN. Phloretin, capsaicin and pseudocap- 141716A at the concentrations shown in Fig. 3. After the incubation saicin were purchased from Sigma, forskolin from Fluka, and AM404 cells were extracted, and cAMP levels determined by means of a from Cayman Chemical. Olvanil was synthesized in the Naples labo- cAMP assay kit (Amersham), as advised by the manufacturer. ratory by reacting 30 mg of 3-methoxy-4-hydroxy-benzylamine with an excess of oleoylchloride at 4³C for 30 min. The mixture was then brought to dryness under a £ow of N2 and puri¢ed by normal phase 3. Results and discussion high pressure liquid chromatography (NP-HPLC) carried out with a semi-preparative column (Spherisorb S5W) eluted with a 40-min lin- In a previous study [13] we showed that, in RBL-2H3 cells, ear gradient from 90% to 80% of n-hexane in 2-propanol (£ow rate 2 ml/min). Under these conditions olvanil was eluted after 27 min. distinct uptake mechanisms exist for AEA and its anti-in£am- Electron-impact mass spectrometric analysis, carried out on an HP- matory congener PEA [16]. The di¡usion of both acylethanol- 5989B quadrupole mass analyzer equipped with an electron impact amides into intact RBL-2H3 cells was maximal after 20^30- source operating at 70 eV and 250³C, con¢rmed the chemical struc- min incubations, saturable, inhibited by N-ethylmaleimide ture of the compound (m/z = 417, molecular ion; m/z = 294, loss of a 3-methoxy-4-hydroxy-phenyl group; m/z = 137 and 281, cleavage of and PMSF, and greatly reduced at 0^4³C. However, the two the CH2-NH bond). Experiments with intact cells were carried out compounds did not compete for each other's uptake. RBL- as described previously [13] in six-well dishes (about 1.0U106 cells/ 2H3 cells were also found to express an `AEA amidohydro- well). Cells were incubated at 37³C with 0.5 ml of serum-free media lase' activity [13] which was later identi¢ed as FAAH [17]. In 14 14 containing 20 000 cpm (4 WM) of either [ C]AEA or [ C]PEA agreement with the presence of distinct transporter proteins for 30 min with the substances shown in Figs.
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